According to common sense.
When a soul enters someone else's body, there's only one possibility.
That is to eradicate the other's soul, take possession of the body; this is called possession.
But dual souls coexisting—though such cases exist—they only occur in those with special constitutions, and it's virtually impossible to achieve through acquired means.
When the Ancestor Dragon and Xuan Master heard Lu Changsheng's idea,
they were both utterly stunned. They exchanged a glance, each seeing disbelief in the other's eyes.
"This… can it work?" Xuan Master asked hesitantly, looking at Lu Changsheng, his expression somewhat doubtful. "Dual souls coexisting? Such a precedent has never appeared anywhere in the Chaos Realm."
Moreover, this wasn't ordinary dual-soul coexistence but a method where the switch could occur seamlessly, without side effects or even the slightest hitch.
